1, my parents (not/swim)………….. in the pool since 2010 2, they (sing)……………. together yesterday 3, last night

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1. * Cấu trúc thì quá khứ đơn 

   (+) S +V (ed/ cột 2) 

   (-)  S + didn’t + V 

   (?) Did + S + V?

   – DHNB: ago, last,..

   * Cấu trúc thì HTHT 

   (+) S + have/has + V-pp 

   (-) S + haven’t/hasn’t + V-pp

   (?) Have/Has + S + V-pp+…?

   – DHNB: yet, already,..

   __________________________________________

   1. haven’t swum 

   – DHNB: since

   2. sang 

   – DHNB: yesterday 

   3. didn’t cook

   – DHNB: last night

   4. have just washed 

   – DHNB: just

   5. haven’t talked 

   – DHNB: for 3 years

   6. didn’t drink 

   – DHNB: yesterday

   7. visited 

   – DHNB: last

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